Expandable Stone Extraction Assembly for Single-Instrument Dilation
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Solution Overview
Problem
Existing minimally invasive surgical procedures for extracting objects, such as biliary stones, often require multiple instruments, increasing procedural complexity and risk of injury due to the need for separate devices to dilate and extract the stone.
Innovation Solution
A medical device with multiple expandable members, including an outer shaft, inner shaft, and tubes, where the expandable members can radially expand or compress in response to relative movement of the shafts, allowing for a single instrument to perform dilation and extraction tasks, reducing the need for multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple instruments are used for extracting objects from within a subject, then the extraction function is achieved, but the procedural complexity increases and the risk of injury increases
Solution Approach 1:
The patent combines multiple extraction instruments into a single integrated device. The extraction assembly includes multiple expandable members (first expandable member for dilation, second expandable member for stone engagement) that can be deployed sequentially or simultaneously from one catheter, eliminating the need for separate dilation catheters and extraction baskets, thereby reducing procedural complexity and potential injury risks from multiple instrument insertions
Solution Approach 2:
The single extraction device performs multiple functions: the first expandable member dilates the ampulla, the second expandable member engages and extracts biliary stones, and the device can also function as a guidewire delivery system. This multi-functional design replaces what previously required multiple specialized instruments, simplifying the overall procedure while maintaining comprehensive extraction capability
2Adaptability or versatility
If multiple instruments are used for dilation and extraction, then the specific functions are achieved, but the number of devices increases
Solution Approach 1:
The extraction assembly is segmented into distinct functional modules: a first expandable member for dilation, a second expandable member for stone engagement, and an inner shaft with outer shaft for deployment control. Each segment performs a specific function but all are integrated into one device, allowing the system to maintain high adaptability for different procedural needs while presenting as a single device to the operator
Solution Approach 2:
The device employs a nested structure where the inner shaft containing the first expandable member is positioned within the outer shaft, and the second expandable member is disposed within the inner shaft. This nested arrangement allows multiple functional components to be housed within a single device footprint, enabling complex multi-functionality without increasing the number of separate devices required
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device simplifies the procedure by integrating dilation and extraction functions, minimizing tissue injury and procedural complexity through controlled expansion and contraction of expandable members, facilitating safe and efficient removal of objects from bodily cavities.
Implementation Method 1
The first expandable member is configured such that the proximal end is movable relative to the distal end when the outer shaft moves relative to the inner shaft. The first expandable member is configured to radially expand when the proximal end moves toward the distal end and radially compress when the proximal end moves away from the distal end.
Implementation Method 2
The second expandable member is in fluid communication with a lumen of the tube and configured to receive a fluid from the lumen. The second expandable member is configured to move relative to the tube in response to receiving the fluid from the lumen.
Implementation Method 3
The third expandable member is configured to move from a compressed state to an expanded state in response to the third expandable member extending outwardly from an outer tube. A distal portion of the third expandable member expands radially outward when transitioning from the compressed state to the expanded state of the third expandable member.
Data Source
AI summary
A medical device that includes an outer shaft, an inner shaft disposed within the outer shaft, and a tube disposed within the inner shaft and the outer shaft. The medical device includes a first expandable member having a proximal end secured to the outer shaft and a distal end secured to the inner shaft. The inner shaft and the tube are received through the first expandable member. The first expandable member is configured such that the proximal end is movable relative to the distal end when the outer shaft moves relative to the inner shaft. The first expandable member is configured to radially expand when the proximal end moves toward the distal end and radially compress when the proximal end moves away from the distal end.